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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Phosgene, Cl2CO, is a highly toxic gas that was used as a weapon in World War 1. Using the bond dissociation enthalpies in Table 8.8, estimate the enthalpy change for the reaction of carbon monoxide and chlorine to produce phosgene.

CO(g) + Cl2(g) → Cl2CO(g)

Interpretation Introduction

Interpretation: The enthalpy change for the given reaction has to be determined.

Concept Introduction:

Bond dissociation enthalpy:

Bond energy or more correctly the bond dissociation enthalpy is the enthalpy change when breaking a bond in a molecule with the reactant and products in the gas phase.

ΔrH=ΔH(bondsbroken)ΔH(bondsformed)

Enthalpy of formation:

ΔrH=ΔfH0(products)ΔfH0(reactants)

Explanation

Given reaction is as follows:

CO(g)+Cl2(g)Cl2CO

Using the bond dissociation enthalpy, we can estimate the enthalpy change for this reaction.

Bond dissociation enthalpies for different bonds are given below:

COis1046kJ/mol

ClClis242kJ/mol

C=Ois745kJ/mol

CClis339kJ/mol

Examining the reaction, there are 1CO and1Cl-Cl broken in reactant side and the bond formed in product sides are 2Cl-Cl and1C=O bonds

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